Each day, the Glenwood Hot Springs mammoth pool circulates with 3.5 million gallons of naturally heated spring water. Glenwood opened in 1888 as the world's largest hot springs pool. GoEscape

Once visitors arrive to this laid-back getaway near Steamboat Springs, they'll find a stunning Rocky Mountain wilderness setting. Soakers can choose from four creekside rock pools crafted to seem like part of the landscape. The springs have a split personality. During the day, it's open to all and offers a range of wellness services. After dark, the springs are limited to guests over 18, and it becomes clothing-optional. GoEscape

The Springs Resort & Spa: With nearly two dozen pools of different sizes and water temperatures, you can spring hop to your heart's content at this historic resort along the San Juan River. Five pools are limited to adults only, while others are kid-friendly with chlorinated water. GoEscape

While some springs play up their rustic side, at Dunton the emphasis is on luxury. Nearly two decades ago, a European industrialist purchased an abandoned mining town and slowly turned it into a 1,400-acre ultra-private retreat. A former saloon now turns out gourmet meals and serves fine wines, and once-dilapidated shacks have been transformed into retreats with their own hot spring–fed water.
Dunton has earned a reputation (and awards) as one of the top all-inclusive resorts in the world. GoEscape

The springs offer stunning views of the Wilsons, a surrounding mountain range with peaks higher than 14,000 feet. You'll find several indoor and outdoor pools that offer a range of temperatures and experiences, some in a natural setting, others in pools or tubs. And given the European influence and clientele, it's no surprise they're all clothing-optional. GoEscape

Rocky Mountain hot pools warm winter bathers: Colorado and the Rocky Mountain West is hot springs–central, with literally hundreds of these soaking spots. Some include full-blown wellness centers, while others may be just handmade pools of rocks on the edge of a river. Pictured here: Granite Hotsprings Pool. In what seems to be the middle of the Wyoming wilderness, visitors find an enclosed spring-filled pool, 7,000 feet up. Bob Woodall

Granite Hotsprings Pool in Bridger-Teton National Forest, south of Jackson, Wyo., is open year-round. The area, which gets 400 inches of snow a year, can only be accessed via cross-country skis, snowshoes or snowmobiles. But the most exciting way is on a dogsled. Jackson Hole Iditarod Sled Dog tours offer daylong wilderness outings, allowing time for a long relaxing soak in the naturally heated water. Bob Woodall

This article is excerpted from GoEscape, USA TODAY's travel magazine, on sale now. Buy wherever magazines are sold or at goescape.usatoday.com. GoEscape